I got exactly this problem. I bought a code early access from a site for 2.99 euro cause with my old ff14 account i didn't have the permissions to do that.
With my character in game i m lv42 and since some mitunes ago i m not able to enter with this account.
I really hope they will fix this problem as soon as possible cause with my free company we rushing for lv50 and now i don't know if my account will be disabled forever
Please help me i really don't know what to do in this moment